linux-kernel - Re: [PATCH 6/6] platform/chrome: cros_ec_spi: drop BUG

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Date:   Fri, 13 May 2022 13:00:05 +0800
From:   Tzung-Bi Shih <tzungbi@...nel.org>
To:     Guenter Roeck <groeck@...gle.com>
Cc:     Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] platform/chrome: cros_ec_spi: drop BUG_ON()

On Thu, May 12, 2022 at 08:14:10AM -0700, Guenter Roeck wrote:
> On Thu, May 12, 2022 at 1:37 AM Tzung-Bi Shih <tzungbi@...nel.org> wrote:
> >
> > It is overkill to crash the kernel if the `din` buffer is going to full
> > or overflow.
> >
> > Drop the BUG_ON() and return -EINVAL instead.
> >
> > Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
> 
> Wonder if the return code should be -EPROTO instead, but I don't have
> a strong opinion.

Thanks for the review.  I am going to split the patch into 2 smaller pieces.

For those related to preamble bytes, at the first glance, they could use
-EPROTO.  But, no, they are irrelevant to the protocol.  I would drop them.
See [1].

For those `din` isn't large enough, I would keep using -EINVAL as they look
more like the `ec_dev` didn't configure correctly.  See [2].

[1]: https://patchwork.kernel.org/project/chrome-platform/patch/20220513044143.1045728-7-tzungbi@kernel.org/
[2]: https://patchwork.kernel.org/project/chrome-platform/patch/20220513044143.1045728-8-tzungbi@kernel.org/